HOUSTON (AP) — Carnival Cruise Lines has canceled voyages through April aboard the Triumph, a ship that has been plagued by mechanical problems in recent weeks and was finally left powerless in the Gulf of Mexico after an engine-room fire.

Carnival's announcement of the 12 canceled trips came Wednesday as the Triumph was being towed by two tugboats to a port in Mobile, Ala., with more than 4,000 people on board, some of whom have told relatives that conditions on the ship are dismal and that they have limited access to food and bathrooms.

Two other cruises were called off shortly after Sunday's fire.